/Engine/Plugins/Experimental/RenderGrid/Source/RenderGrid/Public/RenderGrid/RenderGridQueue.h
Returns the number of jobs that have finished rendering. Basically just returns [Get Jobs Count] minus [Get Jobs Remaining Count].
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintPure, Category="Render Grid Queue", Meta=(Keywords="rendering progression obtain number amount finished")) int32 GetJobsCompletedCount() const